The Interstate League was the name of five different American minor baseball leagues that played intermittently from 1896 through 1952.
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The longest tenured of these was the last incarnation, which played in the Middle Atlantic States from 1939 through 1952, and was one of the few mid-level minor leagues to operate continuously during the World War II period.
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This circuit, which began as Class C and was upgraded to Class B in 1940, typically had teams in Allentown, Harrisburg, Lancaster and Sunbury, all in Pennsylvania; Hagerstown, Maryland; Trenton, New Jersey; and Wilmington, Delaware.
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In addition, a Class C Interstate Association existed for one season, 1906, in Michigan, Indiana and Ohio.
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